112 



GENERAL REMARKS 



I'ig 



beneath it, there is often an accumulation of sap in the swoll«:n vessels in n (juantity 

 sufficient to flow out in a rapid stream for a moment after it is wounded. This blighted 

 part bears large and healthy fruit, as represented in the cut. 



Fig. 2. A stem two years old, from an apple tree in 

 Mr. Prentice's garden. 



a, Dead band, forming a constriction of the branch; b, a 

 layer of new bark formed beneath the old bark; c, living 

 interior the wood of last year, through which the life of llie 

 stem beyond the constricted portion is preserved. 



Fig. 3. A short piece of a branch, showing an area of 

 dead or blighted portion, in the centre of which stands 

 a dead stem. 



a, Dead stem, dry and brittle; b, living interior, with a 

 projecting point extending up to the centre of the dead 

 stem ; cc, dead bark extending around the dead stem ; c e, 

 living bark. 



This dead portion is a patch about an inch and a half in 

 diameter, measured along the stem. It docs not, however, 

 embrace the whole of it or extend entirely around it ; and 

 it is not unusual for the blight to affect an area in which 

 there is a small branch in its centre, or nearly so. 



Close observation upon the state of the weather, the 

 character of the winds, etc., seems to be highly important. 

 We ought to remark that the disease appeared to have 

 ceased its ravages for three or four weeks preceding the first 

 of August. Our heaviest rain for the season occurred on 

 the 30th of July. The heat of the three days after this 

 heavy rain, had been rather oppressive ; and now, the fourth day, the leaves of the branches, 

 which are remarkably vigorous, begin to curl and lose their bright green, as if another 

 attack had commenced. A few days will determine the fact. We may remark, too, that 



Fig. 3. 



the beautiful and vigorous pines of Mount Hope, the 

 residence of Mr. Prentice, exhibit the same pheno- 

 mena as the fruit trees. The terminal branches in 

 these pines, is the scat of the disease. It does not 

 seem to extend to the large branches. One fact in 

 regard to Mr. Prentice's garden and orchard, ought 

 not to be forgotten, viz: that he uses much stimulat- 

 ing, azotized manure, from his establishments. It is not stated, however, as proving that 

 high living, in the case of vegetables, predisposes to the blight; and yet, it appears that 

 some of the worst cases of the potato disease have happened when they have been highly 

 manured. The effect of rich manures, especially those abounding in organic matter, 



